Police arrived to investigate at Compunetix on Mosside Boulevard while WTAE's Janelle Hall was watching surveillance video with senior vice president Joseph Kasunich.

"It was a combination of vehicles broke in, as well as a lot of damage. There were windshields broken, back windshields completely broken. A knife was actually found on one of the vehicle tires, paint still on the knife," Kasunich said. "The individuals didn't just feel that breaking windshields and stealing something out of the vehicles was enough damage. They actually scratched paint up and down both sides of the cars."

Police said teens on bicycles rode from the Pitcairn area to the Compunetix parking garage and wore gloves and hoods while they spent more than an hour breaking into and vandalizing 17 vehicles at about 1 a.m.

Hall reported that the vandals broke some of the surveillance cameras in the garage, and their faces were not captured on the video footage.

Mostly money was taken from the vehicles, police said.

"Whether this was a prank by youth or whether this was an attempt to find and steal money, it was really disgusting," said Kasunich.

The investigation continues. No suspects have been identified.

In photos: Cars trashed in Monroeville parking garage

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Nearly 20 parked vehicles were broken into and damaged at Compunetix in Monroeville.